电焊机2025，Vol.55Issue(6)：140-146,7.DOI:10.7512/j.issn.1001-2303.2025.06.19
机械振动对核电用16MND5埋弧焊焊缝组织与性能的影响
Effect of Mechanical Vibration on the Microstructure and Mechanical Proper-ties of 16MND5 Submerged Arc Welded Joints for Nuclear Power Applications
郑浩 1涂腾 1李海博 1吴坤任1
作者信息
- 1. 中国核动力研究设计院,四川 成都 610213
- 折叠
摘要
Abstract
To address the challenges of residual stress concentration and microstructural control in submerged arc welded joints of low-alloy high-strength steel 16MND5 for nuclear reactor pressure vessels(RPV),this study proposes a mechanical vibration-assisted welding process and systematically investigates the effects of vibration on weld microstructure,mechani-cal properties,and residual stress distribution.Vibration welding experiments(98-100 Hz frequency)were conducted,and the contour method was employed to reconstruct the residual stress field of welded joints through reverse analysis.Micro-structural characterization and mechanical testing were performed to reveal the evolution of microstructure and properties.Results indicate that mechanical vibration promotes the formation of acicular ferrite(AF),suppresses granular bainite(GB)formation,and achieves grain refinement.The peak longitudinal residual stress in the weld joint is significantly reduced and uniformly distributed,while yield strength and hardness exhibit slight decreases.Notably,elongation and low-temperature impact toughness remain unaffected.Mechanistic analysis reveals that vibration enhances the cooling rate of the weld pool,modulates the under-cooled austenite phase transformation pathway,and releases lattice distortion energy through disloca-tion slip,thereby synergistically alleviating residual stress and optimizing microstructure.This study demonstrates that vibration-assisted welding effectively improves the stress state of thick-walled nuclear components without additional post-weld heat treatment,offering theoretical and technical insights for advancing manufacturing processes of RPV critical welds.关键词
核反应堆压力容器/埋弧焊/焊缝金属/残余应力/轮廓法/振动焊接Key words
nuclear reactor pressure vessel(RPV)/submerged arc welding/weld metal/residual stress/contour method/vi-bration welding分类
金属材料引用本文复制引用
郑浩,涂腾,李海博,吴坤任..机械振动对核电用16MND5埋弧焊焊缝组织与性能的影响[J].电焊机,2025,55(6):140-146,7.
